I prefer classic trading by myself, but if you're looking for other ways, I believe affiliation programs are a good idea. Check for example
futurobetnetwork.comI can honestly recommend FuturoBet affiliate program. I'm taking part in it, that's quite encouraging. It could be one way of generating some income which could be a good start in cryptocurrecy world.
I don't think that you can earn a lot being an affiliate in such platform but i'm ready to change my mind ;d
For me, investing is the best way to quickly earn some cryptos. Unfortunately, without investing your own money it would be difficult to gather profit that could be satisfying, it's just the way how it is.
Working for cryptocurrencies company is an opportunity to earn in cryptocurrencies; there are still many bounty programs or airdrops out there.